Space telephony.



L. DE FOREST.

SPACE TELEPHONYL APPLICATION FILED JUNE 25, 1907.

Patented July 6, 1909.

2 SHEETS-SHEET 1 WITNESSES:

L. DE FOREST? SPACE TELEPHONY.

APPLICATION I'ILEIJ JUNE 26, 1907.

926,937. PatentdJu ly 6,1909.

2 BHEET8-BKIIET 2.

sion may take place and in general to im UNITED STATES rnrEN'r OFFICE.

LEE DE FOREST, OF NEW YORK, N. Y., ASSIGNOR TO DE FOREST RADIO TELEPHONE 00., A

CORPORATION OF NEW YORK.

SPACE TELEPHONY.

Specification of Letters Patent.

Patented mi, 0, 1m.

Application m man; 1901. Serial No. amass.

To all whom it my concern:

Be it known that I, LEE DE Fonnsr, a citizen of the United States, and a resident of New Xork, in the county of New York and State of New York, have invented a new and useful Improvement in Space Telephony, of

which the followin is a specification.

My invention re ates to space telephone transmitting systems, and its ob ects are to increase the istance overwhich transmis- I prove the efliciencof such systems.

. means shown in Fig, 1.

p oying a single antenna.

systems in whic The drawings w ich accompany and form a part of this specification representin diagram several arrangements of apparatus and circuits whereby said objects may bereal ized; I but it'will be understood that vI do not limit myself to the particular arrangement therein shown inasmuch as many modifications mav be made in the apparatus and in the circuitswithout departing from the principle of myinvention.

In thedrawings Figures 1-and2 represent s ace, telephone transmittin systems emig. 1 shows a modification ofthe common controlling Fig. 2 re resents a detail of construction represente conventionally in Fig. 2. Figs. 3 and 4 show modified forms of s acetelegraph, transmitting ii two, antennas are employed.

In the figures G is a source of electrical energy herein shown as a direct current generatoni R R are resistances or impedances.

C C C C, are condensers. I i

S S are the secondary windings of oscillation transformers. Q 4

P P are transformerprimaries.

T T are transformer tertiaries.-

A A are antennae earthed at E E respectively.

H H are dischargers for the capacities C C,- respectively, and in the present instance are represented as separated arc electrodes between each pairof which electric arcs maybe created. I

M M M are transmitting devices of any suitable construction and herein shown, as

microphones orvariable resistance devices.

The circuits C H P, C H" P are oscillation circuits, each adaptedto develop high frequency. electrical oscillation havingthe same time period. The oscillations developed by said circuits may have a spark-frequency i I l higher than the more essential frequencies accompanying articulate speech, or a sparkfrequency higher than the limit ofaudibility, or as shown, each circuit may be a continuously-oscillating circuit ora sin ingarc circuit of an approved .type. nasmuch as there is a imit to the amount of .energy that may be em lo ed with a singingarc circuit, about one-hall kilowatt being the maximum amount of power thatmay be employed, I prefer to use a plurality of such circuits each associated in any suitable manner with a radiating conductor, as shown in-Figs. .l and 2, or each associated with a different one of aplurality of radiating conductors, as

ated with. its oscillation circuit in any suitable manner. Y L

In Figs. 1, 2 and 3, the telephone transmitting devices M M are shown asincludsd in the circuits of the tertiary windings T T respectively, and in Fig. 4 they are shown as connected m the earth connectors of the antennee A A respectively.

In Figs. 1, 3and 4, the common controlling means for the transmitting devices M M consists of the master transmitter M, which may be a microphone transmitter andwhich by varying the resistance ofthe circuit ofthe battery B causes the electroma nets D D'to actuate the devices M M. In s. l and 4 the coils of said electromagnets D are in series althou h, as shown in Fig. 3, they may be connects in multiple.

In Fig. 2, the controllingmeans for the transmitting devices consists in the megaphone arrangementF, whereby the soundwaves may be directed to both transmitters M M. As indicated in Fig. 1", the controlling device F may be employed with the ar rangement of circuits shown in. Figa the leads a, b, c, d, of Fig. 1 corres ending with the similarly lettered leads in ig. 1.

The tertiary windings T T in the circuits which, as shown in Figs. 1, 2 and 3, include the, transmitting devices, M M, may-beassociate d with the primary windings P P re- T T are preferably ondary S and the primaries P P preferably surround the tertiaries aries S S as indicated in Figs. 2 and 3 respectivel W is the separation of the primaries P P with their secondary or secondaries may be lateral, I prefer the axial arrangement conventionalky shown in Fig. 2 and illustrated in detail in ig. 2.- In this case the tertiaries associated with the sec- T T respectively and the common secondary S. The coefficient of coupling may be varied by relative axial movement between P and S, and P and S.

' As indicated in Figs. 1 and 2, each tertiary circuit may be attuned as by the condensers C, C respectively, to the frequency of the oscillations develo ed by the oscillation-circuits C H P, C if P or to any other frequency desired. In this manner the amount of energy absorbed by the tertiary circuits which include the transmitting devices can be varied and also said transmitting devices can be located at points of minimum potential and maximum current, or maximum potential and minimum current according to their construction.

I claim:

1. In a space telephone transmitting system, the combination with a plurality of oscillation circuits, of a like number of transmitting devices, each associated with a different one of said oscillation circuits, controlling means common to all of said transmitting devices for controlling the same, and means for converting the energy of said oscillation circuits into electroradiant energy.

2. In a space telephone transmitting system, the combination with a plurality of oscillation circuits, of a like number of variable resistance transmitting devices, each associated with a different one of said oscillation circuits, controlling means common to said transmitting devices and means for converting the energy of said oscillation circuits into electroradiant energy.

3. Ina space telephone transmitting system, the combination with a plurality of oscillation circuits, of a like number of transmitting devices, each associated with a different one of said oscillation circuits, a controlling device common to said transmitting devices, said controlling device comprising means for directing sound waves to all of said transmitting devices, and means for converting the energy of said oscillation circuits into electroradiant energy.

4. In a space telephone transmitting system, the combination with a lurality of oscillation circuits, of a like num er of transmitting devices, each inductively related to a different one of said oscillation circuits,

means common to all of said transmitting devices for controlling the same and means for converting the energy of said oscillation circuits into electroradiant energy.

5. In a space telephone transmitting sys tem, the combination with a plurality of oscillation circuits, of a like number of tertiary circuits, each associated with a different one of said oscillation circuits, a like number of transmitting devices, .each included in a different one of said tertiary circuits, controlling means common to said transmitting devices and means for converting the energy of said oscillation circuits into electroradiant energy.

6. n a space telephone transmitting system, the combination with a plurality of oscillation circuits, of a transformer having one secondary winding and a plurality of primary windings, each of said primary windings be ing included in a different one of said oscillation circuits, a like number of transmitting devices each associated witha different one of said oscillation circuits, controlling means common to said transmitting devices and means for converting the energy of said oscillation circuits into electroradiant energy.

7. In a space telephone transmitting system, the combination with a plurality of oscillation circuits, of a transformer having one secondary winding and a plurality of primary windings co-axially arran ed therewith, each of said primary windings being included in a different one of said oscillation circuits, a like number of transmitting devices, each associated with a different one of said oscillation circuits, controlling means common to said transmitting devices and means for converting the energy of said oscillation circuits .into electroradiant energy.

8. In a space telephone transmitting system, cillation circuits, of a transformer having one secondary winding and a plurality of primary windings, each of said primary windings being included in a different one of said oscillation circuits, a plurality of tertiary circuits, each associated with a different one of said primary windings, a like number of transmitting devices, each included in a diiferent one of said tertiary circuits, controlling means common to said transmitting devices and means for converting the energy of said oscillation circuits into electroradiant energy.

9. In a space telephone transmitting system, the combination with a plurality of oscillation circuits, of a transformer having one secondary winding and a plurality of primary windings, each of said prlmary windings being included in a different one of said oscillation circuits, a plurality of tertiary windings each co-axially arranged with respect to said secondary and associated, res ectively, with said primary dings, a li e number of the combination with a plurality of'ossoaps? different one of said tertiary'windings, c6ntrolling means common to said transmitting devices and means for converting the energy of said oscillation circuits into electro'radiant energy.

10. In a space telephone transmitting system, the combination with a plurality offoscillation circuits, of a transformer having one secondary winding and a plurality of primar windings co-axially arranged therewith, eac of said primary windings being included in a different one of said oscillation circuits, a

plurality oftertiary windings arranged coaxially with respect to said secondary and each associated with a'diil'erent one of said 11. In a space telephone transmitting sysof said oscillation circuits into electrora iant energy;

tem, the combination with a plurality of osprimary windings and surrounding said secondary windings,- a like manner of transmitting devices, each associated with a dilferout one of said tertiary windings, controlling.

means common to said transmitting devices, and means for converting the energy of said oscillation circuits into elcctroradiant energy.

In testimony whereof, I have hereunto subscribed my name this 19tliday of Julio,

' LEE DE FOREST.

Witnesses:

.' THOMAS I. GALLAGHER,

Gao. K. WOODWORTH. 

